Register-translator crossbar telephone system



THOUSANDS STAGE Dec. 22,1959 E. J. LEONARD ETA. 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19. 1956 19 heets-Sheet 1 TSG REGISTERS LINE STAGE LINE CONTROLLER FIG. I

22, 1959 E. J. LEONARD ETAL 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 19 Shets-Sheet 3 J 3oo-A L r 555 FIG. 3 THOUSANDS STAGE SELECTOR CONTROLLER Dec. 22, 1959 E. J. LEONARD ET AL REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM 19 Sheets-$heet 4 Filed Dec.

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REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM I Filed Dec. 19, 1956 19 Sheets-Sheet 5 FIG 5 CONNECTOR Cl 22, 1959 E. J. LEONARD EI'AL 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM FROM LINES 00 TO 09 Dec. 22, 1959 E. .1. LEONARD L-rAL 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 19 Sheets-Sheet v 22! TO/FROM CONNECIORS Cl TO CIS seo FIG. 6, PART 2 sea Dec. 22, 1959' FIG. 8, PART! E. J. LEONARD ETAL REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 19 Sheets-Sheet 9 17388 0.]. I88 880105138 WOHzl/OJ. 30b

1959 E.'J. LEONARD ETAL 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 9 Sheets-Sheet 1o 3|2/4l2 TO/FROM FIFTH SWITCH 300/400 FIG. 9

404 TO/ FROM SELECTORS S81 TO 5824 22, 1959 E. .1. LEONARD ETA]. 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 19 Sheets-Sheet 11 vmwu OF mh mm POwJmm zomutok mom).

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REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 19 Sheets-Sheet 12 309 TO/FROM ALLOTTER IOO FIG. H, PART! REGISTER R! o it f m" i-"lr'w' '6 CD 55 E nie; f

306 TO/F ROM ACCESS SWITCH 350 Dec. 22, 1959 REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 E. J. LEONARD ET AL FIG. H, PART 2 19 Sheets-Sheet 13 307 TO/FROM SELECTOR CONTROLLER BOOF 1959 E. J. LEONARD ETAL 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 19 Sheets-Sheet 14 FIG. H, PART 3 Dec. 22, 1959 E. .1. LEONARD ETAL 1 REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 19 Sheets-Sheet 15 308 TO/FROM TS |,FIG.|2

FIG. H, PART4 1959 E. J. LEONARD ETAL 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM 19 Sheets-Sheet 16 Filed Dec.

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REGISTER-TRANSLATOR CRQSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 19 SheetsPSheet 17 FiG. l3, PARTI Dec. 22, 1959 E. J. LEONARD ETAL 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 1,9 Sheets-Sheet 18 EH @3 y a NNQ W 00. m: E 0: W586 Dec. 22, 1959 E. J. LEONARD ETAL 2,918,533

REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Filed Dec. 19, 1956 '19 Sheets-Sheet 19 m glml A .5 z a n. Q 22' LL.

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o... m mm m REGISTER-TRANSLATOR CROSSBAR TELEPHONE SYSTEM Edward J. Leonard, Chicago, neth A. Karow, Chicago,

Keith L. Liston, Elmhurst, Ill., and Harry Tarschlsch, Zurich, Switzerland, assignors to International Telephone and Telegraph Corporation, New York, N. a corporation of Maryland Application December 19, 1956, Serial No. 629,282 a 15 Claims. Cl. 179-18 Albert Heme], Skokie, Ken- This invention relates to a register-translator crossbar telephone system, and its principal object is to provide a telephone switching system of the indicated type which is eificient and economical in its use of switching apparatus at the several switching stages as well as in its use of auxiliary control relays and other apparatus, while employing an efiicient and economical register-translator arrangement.

This application is a continuation in part of our prior application Serial No. 564,605, now abandoned, for a Register-Translator Crossbar Telephone System, filed in the United States Patent Oflice January 20, 1956, by E. 1. Leonard et al.

In automatic telephone systems using crossbar switches to complete connections between calling and called lines, it is customary to follow the usual practice of providing one or more ofiices having a maximum office capacity of 10,000 lines or numbers, and to provide switching stages in any such office comprising a non-numerical or linefinder stage, followed by numerical stages comprising one or morestages of ofiice selectors, followed in turn by two or more switching stages through which the subscriber lines of the ofiice are reached. According to one common practice, the subscriber-access numerical stages comprise thousands and hundreds selector stages and a connector stage.

At any numerical switching stage, it is customary to provide the crossbar switching apparatus in the form of one or more frames of equipment, and to provide control apparatus common to all the paths through a single crossbar switch, or through a group of crossbar switches on the frame. Such common controlling apparatus is called in temporarily when a switching path is to be completed through any associated crossbar switching apparatus, thus supplementing the relays and/ or control apparatus individual to the respective talking paths or trunks incoming to the stage. A recording or registering operation must occur for any numerical stage to direct the extension of the connection therethrough, by the closing operation of a crossbar switch. This registering operation is controlled directly or indirectly by the called (or dialed) digits of telephone numbers. In certain known systems, each trunk incoming to a numerical switching stage includes individual apparatus for recording the digit or dig its required at that stage for the directing operations, while in other known systems a common pool of registers is provided in association with the trunks at the first numerical switching stage to record all of the digit information relating to the call, following which the information is passed to an interstage marker arrangement which forms a portion of the common apparatus for the several switching stages, or is sent forward over the extended connection for such recording as may be desired at the subsequent switching stages as they are successively encoun tered during the progress of the connection toward the called line.

The foregoing known systems have, for the most part, been open to the objection that the interstage common John C. Gibson, Oak Lawn,

United States PatentO marker arrangements are very complicated and cumbersome, where used, or that theforward sending of stored digit information to successive stages has been slow because of the limitations of the registers heretofore used at such succeeding stages and the registers themselves have been a matter of considerable expense.

According to the invention, the foregoing and related drawbacks of prior crossbar telephone switching systems have been largely overcome by providing a new control arrangement for the stages of crossbar switches which includes a pool of number registers accessible from the trunks leading to the first numerical switching stage, in cooperation with a low-cost translation arrangement based on the use of small-capacity translators numerically accessible to the number registers in common and pertaining respectively to separate blocks of called numbers.

In the illustrated embodiment, a 10,000 number ofiice uses ten 1,000-number translators.

Further, according to the invention, the translator pertaining. to the number block in which the called number is located is seized from the number register in use, where-,

upon the registered numberis transferred to the trans lator and is canceled in the number register. The translator thereupon effects the registration of a translated register in succession to transmit any registered digit forward by a fast two-pulse marking system which employs alternating current over the talking conductors of the connection and includes a selective rectifier arrangement. A digit so transmitted may have any one of fifteen values when four-relay registers are employed as receivers of the transmitted information. A special feature of this arrangement is that the receiving registers at any numerical switching stage are located in the common control apparatus of the stage, thereby representing a considerable saving as compared to an arrangement requiring individual digit registers at the respective trunk paths.

According to a further feature, a high speed of call completion is secured by the timely forwarding of' the successive directing digits While guarding againstth'e premature sending of digit information.

transmitting the digit information to a succeeding stage upon the receipt of revertive information over the connection that the switching operation at the crossbar switching stage last controlled has been completed.

Further features of translator economy is concernedwith the use of a specialized rectifier matrix, with rect'i fier diodes which are physically movable to desired crosspoint locations to determine the translated digit combination to be impressed responsive to the receipt of called number information through the register-controlled relaytree contacts, and with a dual-marking arrangement which operates the relays which record the translated information according to a code which permits a great reductionthus be completely divorcedtfrom dependence upon relai tive switchboard locations of the line terminals. This feature is utilized to permit so-called P.B.X, or common A sequence control arrangement is used in the number register for 

